JP5271553B2 - Inundation detection structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water infiltration detection structure capable of preventing an inter-wire short circuit by detecting water infiltration into a cylindrical member housing wires and cables. <P>SOLUTION: The water infiltration detection structure 31 is composed of a metal protecting tube 32, a plurality of cables with water infiltration detection function 33 housed inside the metal protecting tube 32, an insulator 34 covering an outside of the metal protecting tube 32, a grounding wire 35 connected to the metal protecting tube 32, and a current detecting means 36 connected to the grounding wire 35. The cable with water infiltration detection function 33 is structured of a wire 37, a conductive layer 38 with conductivity provided outside the wire 37, and a water-absorbing insulation layer 39 with a water-absorbing property and insulation property provided outside the conductive layer 38. The wire 37 is structured of a conductor 40 and an insulator 41 provided on the conductor 40. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to an inundation detection structure for detecting inundation in a cylindrical member that houses an electric wire / cable.

  In recent years, the hybridization of automobiles has progressed, and the number of components mounted on automobiles has increased accordingly. In addition, there is a demand for expansion of the interior space. Under such circumstances, electric wires and cables that are routed in various parts of the automobile are being routed outside the vehicle such as under the floor. For this reason, the cylindrical member for accommodating and protecting an electric wire and a cable is used.

  In FIG. 2, reference numeral 1 indicates an electric wire obtained by coating a conductor 2 with an insulator 3. This electric wire 1 is accommodated in the inside of the cylindrical member 4 attached and fixed under the floor of a motor vehicle. Here, three electric wires 1 are housed inside the cylindrical member 4.

  As described above, the cylindrical member 4 in which the electric wire 1 is stored is attached and fixed under the floor outside the vehicle, so that there is a risk that a crack or breakage may occur due to, for example, a stepping stone. If a crack or breakage occurs in the tubular member 4, water 5 such as rainwater enters the inside of the tubular member 4 through the crack or breakage. The electric wire 1 will be immersed in the water 5, and this will cause deterioration of the insulator 3 and cause a problem that a short circuit between the electric wires is concerned. In addition, in arrangement | positioning used as an underfloor, since it is very difficult to confirm the presence or absence of inundation, it can be said that it is impossible to detect in advance problems such as a short circuit between wires.

  In FIG. 3, reference numeral 11 indicates a cable provided with the inundation detection line 12. The cable 11 includes three electric wires 15 having a conductor 13 and an insulator 14, a pair of intrusion detection wires 12, a press-winding tape 16 provided outside these, and a sheath 17 provided further outside. It is configured.

The inundation detection line 12 is manufactured in a state in which the insulator removing portion 18 is formed and the conductor 19 is exposed (see, for example, Patent Document 1 below). A pair of inundation detection lines 12 are provided to detect the presence or absence of the inundation 20 by a change in insulation resistance between them. The pair of inundation detection lines 12 are arranged at positions that sandwich the electric wires 15 so that the conductors 19 do not contact each other.
JP-A-6-68718

  If the infiltration detection line 12 of FIG. 3 is configured to be housed inside the cylindrical member 4 of FIG. 2, it is considered that the presence or absence of inundation can be detected. However, as shown in FIG. 3, the pair of inundation detection lines 12 are arranged at positions that sandwich the electric wire 15, and therefore, if a large amount of water 5 does not enter the inside of the cylindrical member 4, the presence or absence of inundation is detected. Has the problem of being unable to.

  The present invention has been made in view of the circumstances described above, and it is an object of the present invention to provide an inundation detection structure capable of detecting inundation in a cylindrical member that accommodates an electric wire / cable and preventing a short circuit between electric wires. And

  In order to solve the above problems, the inundation detection structure according to claim 1 of the present invention is provided with a conductive layer having conductivity on the outside of an electric wire / cable, and has water absorption and insulation on the outside of the conductive layer. A water-absorbing insulation layer is provided to form a cable with a water-infiltration detection function, and one or more cables with the water-infiltration detection function are provided and stored in a conductive metal cylinder member, and the outside of the metal cylinder member is insulated. It is characterized by being covered with an insulating material and having a ground wire connected to the metal cylinder member, and a current detecting means connected to the ground wire.

  According to the present invention having such a feature, when water enters the inside of the metal cylinder member, the water-absorbing insulating layer of the cable with a water immersion detection function absorbs water. In this case, a circuit is formed in which the charging current of the electric wire / cable in the cable with a water immersion detection function flows through the metal cylinder member. Therefore, by measuring the change in the current flowing through the grounding wire, it is possible to detect a very small amount of moisture.

Water sensor structure of the present invention according to claim 2, in detecting water structure according to claim 1, to both ends of the front Symbol function of detecting water contact with cable connector is provided, wherein the metallic tubular member, said It covers the section from the connector located at one end to the connector located at the other end of the cable with a flood detection function .

According to the present invention having such a feature, it is possible to more easily identify the location of the water intrusion by covering the metal cylinder member between the connectors located at both ends of the cable with the infiltration detection function .

  According to the present invention described in claim 1, there is an effect that it is possible to detect water intrusion in a cylindrical member that houses a cable with a water intrusion detection function including electric wires and cables. And by this effect, there exists an effect that a short circuit between electric wires can be prevented.

  ADVANTAGE OF THE INVENTION According to this invention, there exists an effect that a danger prediction can be performed with the signal which detected the penetration | invasion of water by combining with the protection system (the relay and switch for short circuit protection) of the hybrid drive battery in a motor vehicle. . And this effect produces the effect that a safer hybrid system can be constructed.

  According to the second aspect of the present invention, there is an effect that it is possible to easily identify the water intrusion location.

  Hereinafter, description will be given with reference to the drawings. FIG. 1 is a cross-sectional view showing an embodiment of the inundation detection structure of the present invention.

  In FIG. 1, reference numeral 31 indicates the inundation detection structure of the present invention, and a metal protection tube (metal cylinder member) 32 and a plurality (three in this case) housed in the metal protection tube 32. Is an example), a cable 33 with an inundation detection function, an insulator 34 covering the outside (outer surface) of the metal protective tube 32, a ground wire 35 connected to the metal protective tube 32, and the ground wire 35 And current detection means 36 connected to. The inundation detection structure 31 of the present invention is particularly preferably applied to the wiring of a power cable for a hybrid vehicle. In this embodiment, the battery can be prevented from being short-circuited due to an insulation failure of an electric wire / cable. It is provided as a simple structure.

  The metal protective tube 32 is a conductive member, and is not particularly limited, and is formed in a circular cylindrical shape (tube / corrugated shape). The metal protective tube 32 is provided to accommodate and protect the cable 33 with the inundation detection function that is routed outside the vehicle such as under the floor. A plurality of metal protection tubes 32 are provided so that the end portion (connector side) of the cable 33 with a water immersion detection function and the main body can be separated for each metal protection tube 32.

  As will be described later, the insulator 34 provided outside the metal protective tube 32 allows a current flowing through the metal protective tube 32 to flow to the body side via the ground wire 35 instead of flowing directly to the body side. Be prepared for. The insulator 34 is constituted by, for example, a cylindrical member made of synthetic resin having insulation properties, tape winding of a tape having insulation properties, or the like.

  One end of the ground wire 35 is connected to a desired position of the metal protective tube 32. The other end is connected to the body. The metal protective tube 32 is configured such that a current flowing through the metal protective tube 32 flows to the body side via the ground wire 35 by connecting the ground wire 35 as described above. Therefore, the metal protective tube 32 contributes to suppression of power supply noise.

  The current detection means 36 connected to the middle of the ground line 35 is configured to measure a current flowing through the ground line 35 and generate a predetermined signal based on this change. In the case of this embodiment, the generated signal is transmitted to a hybrid drive battery protection system (short-circuit protection relay or switch) and used for danger prediction.

  The cable 33 with an inundation detection function includes an electric wire 37, a conductive layer 38 that is conductive and provided outside the electric wire 37, and a water-absorbing and insulating layer 39 that has water absorption and insulation and is provided outside the conductive layer 38. It is configured with. The electric wire 37 includes a conductor 40 and an insulator 41 provided on the conductor 40.

  The conductive layer 38 is made of, for example, a metal tape or the like, and is provided so as to cover the entire outer surface of the electric wire 37. Moreover, the water absorption insulating layer 39 is comprised, for example with the paper tape etc., and is provided so that the whole outer surface of the conductive layer 38 can be covered. The cable 33 with a water immersion detection function is manufactured in a structure in which the electric wire 37 is pressed and wound by the conductive layer 38 and the water absorption insulating layer 39. In addition, the known connector is provided in the terminal of the cable 33 with a water immersion detection function.

  In the above configuration, when the water 42 enters the inside of the metal protective tube 32, the water absorption insulating layer 39 of the cable 33 with the water detection function absorbs water. When the water-absorbing insulating layer 39 absorbs water, a circuit (see an arrow in the figure) is configured such that the charging current of the electric wire 37 of the cable 33 with a water immersion detection function flows through the metal protective tube 32. Therefore, according to the inundation detection structure 31 of the present invention, it is possible to detect the intrusion of a minute amount of water by measuring the change in the current flowing through the ground wire 35.

  As described above with reference to FIG. 1, according to the present invention, there is an effect that it is possible to detect water (water 42) in the metal protective tube 32 that houses the cable 33 with the water detection function. . Thereby, there exists an effect that the short circuit between electric wires can be prevented. Moreover, according to this invention, there exists an effect that danger can be predicted by the signal which detected the penetration | invasion of the water 42. FIG. This produces an effect that a safer hybrid system can be constructed.

  In addition, the present invention can of course be modified in various ways within the scope not changing the gist of the present invention.

It is sectional drawing (with water immersion) which shows one Embodiment of the water immersion detection structure of this invention. It is a figure which concerns on a prior art example, and is sectional drawing (with water immersion) which shows the state which accommodated the electric wire and the cable inside the cylindrical member. It is a figure which concerns on a prior art example, and is sectional drawing (with water immersion) which shows the cable provided with the water immersion detection line.

Explanation of symbols

31 Inundation detection structure 32 Metal protective tube (metal cylinder member)
33 Cable with inundation detection function 34 Insulator 35 Ground wire 36 Current detection means 37 Electric wire 38 Conductive layer 39 Water absorption insulating layer 40 Conductor 41 Insulator 42 Water

Claims (2)

A conductive layer having conductivity is provided on the outside of the electric wire / cable, and a water-absorbing insulating layer having water absorption and insulation is provided on the outside of the conductive layer to form a cable with a water-infiltration detection function. Are provided in a metal cylinder member having conductivity, and the outside of the metal cylinder member is covered with an insulating material, and a ground wire is connected to the metal cylinder member. Is an inundation detection structure characterized by connecting current detection means. The inundation detection structure according to claim 1,
At both ends of the front Symbol function of detecting water contact with cable connector is provided with said metal tube member, the section from the connector located at one end of the function of detecting water contact with cable to the connector located at the other end Infiltration detection structure characterized by covering .

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